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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-1032] Map from multiple collections with single reduce</title>
                <link>https://jira.mongodb.org/browse/SERVER-1032</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Basically I would like to see a feature that would allow a map reduce job to run across multiple source collections, each with its own map function, and then have the values emitted be processed by a single reduce function.  This could be used to support very simple join scenarios where the reduce function manually joins the different pieces of data that have been emitted for a given key.&lt;/p&gt;</description>
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        <key id="11812">SERVER-1032</key>
            <summary>Map from multiple collections with single reduce</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="dan.shryock">Dan Shryock</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Apr 2010 13:56:23 +0000</created>
                <updated>Wed, 21 Apr 2010 10:31:08 +0000</updated>
                            <resolved>Wed, 21 Apr 2010 10:31:08 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="13739" author="eliot" created="Wed, 21 Apr 2010 10:31:08 +0000"  >&lt;p&gt;I think &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-647&quot; title=&quot;M/R: reduce into existing collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-647&quot;&gt;&lt;del&gt;SERVER-647&lt;/del&gt;&lt;/a&gt; would work for this and other cases.&lt;br/&gt;
If you disagree, please add a comment here.&lt;/p&gt;</comment>
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